Malicious PDF — malware analysis report

Static analysis result for SHA-256 c311ff3ec0bbd941…

MALICIOUS

PDF

76.8 KB Created: 2021-09-17 19:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6316aa229e12ae7fa24c7401776ac3e1 SHA-1: 23c50dc1778feea8a16a081d7614fdf857019f90 SHA-256: c311ff3ec0bbd94180e7a920e4b3804d60d93ebbf2df77e2d323fc77ed289697
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document containing embedded JavaScript and numerous links. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript and the link farm, which includes algorithmically generated URLs and links to compromised CMS uploads, suggest the primary purpose is to redirect users to malicious sites to download further payloads. The use of multiple disposable and compromised domains points to an effort to evade detection and maintain access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://garglob.ru/uplcv?utm_term=married+woman+fan+club+korean+full+movie+online PDF link annotation
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/rereka.pdfIn PDF document text
    • http://salespate.com/userfiles/file/vimevaligozifuf.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/winepasixadegijol.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161381e3ee6eb6---dadodadedes.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/32379925784.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/95997672508.pdfIn PDF document text
    • http://hk-keber.de/images/file/wosaxasupofabu.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/tupivasutuboboj.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a7561e5c---38058033714.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614248d46f285---pixolep.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/wuteb.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/94843770085.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/vidusapomogukixomosox.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cgq4fv10i4lk855odl7bp5akbe/92740051855.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/fipexunepud.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/fijevuv.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/vewidijov.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/bc4d03c4fc10abcba587fde2917f6aa2/71653446676.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613543d30ab04---67248830262.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/palubojipakajukasew.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/vamizexezonigegewomija.pdfIn PDF document text
    • http://rhondachem.com/d/files/lomixinuxopudefubipu.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/51326826073.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CF 10848 bytes
SHA-256: ad11a39934b5ceb9884ec02f913a1013fe4e0ff05b6a618d067af7f31699e822
font_01_sfnt_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 17228 bytes
SHA-256: 7a54473e13901de26acd7135616c3ab0a7b674d763540cc66a65dd18a98a8ade
font_02_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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